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Theorem pnfnre 8063
Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.)
Assertion
Ref Expression
pnfnre  |- +oo  e/  RR

Proof of Theorem pnfnre
StepHypRef Expression
1 cnex 7998 . . . . . 6  |-  CC  e.  _V
21uniex 4469 . . . . 5  |-  U. CC  e.  _V
3 pwuninel2 6337 . . . . 5  |-  ( U. CC  e.  _V  ->  -.  ~P U. CC  e.  CC )
42, 3ax-mp 5 . . . 4  |-  -.  ~P U. CC  e.  CC
5 df-pnf 8058 . . . . 5  |- +oo  =  ~P U. CC
65eleq1i 2259 . . . 4  |-  ( +oo  e.  CC  <->  ~P U. CC  e.  CC )
74, 6mtbir 672 . . 3  |-  -. +oo  e.  CC
8 recn 8007 . . 3  |-  ( +oo  e.  RR  -> +oo  e.  CC )
97, 8mto 663 . 2  |-  -. +oo  e.  RR
109nelir 2462 1  |- +oo  e/  RR
Colors of variables: wff set class
Syntax hints:   -. wn 3    e. wcel 2164    e/ wnel 2459   _Vcvv 2760   ~Pcpw 3602   U.cuni 3836   CCcc 7872   RRcr 7873   +oocpnf 8053
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4148  ax-un 4465  ax-cnex 7965  ax-resscn 7966
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-nel 2460  df-rex 2478  df-rab 2481  df-v 2762  df-in 3160  df-ss 3167  df-pw 3604  df-uni 3837  df-pnf 8058
This theorem is referenced by:  renepnf  8069  nn0nepnf  9314  xrltnr  9848  pnfnlt  9856  xnn0lenn0nn0  9934  inftonninf  10516  pcgcd1  12469  pc2dvds  12471
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